steering ACURA TL 1995 Service Owner's Guide

General Info
Specifications
Maintenance
Engine
Cooling
Fuel and Emissions
2.5L
3.2L
* Transaxle
SteeringSuspension
* Brakes (Including ABS)
* Body
* Heating, Ventilation
and Air Conditioning
* Body Electrical
* Engine Electrical
* SRS2.5L
3.2L
1995±98 TL Main Menu
As sections w/ * include SRS components, special precautions are required when servicing.
ProCarManuals.com

Warning/Caution Label Locations

(cont'd)

D: DRIVER INFORMATION (SUNVISOR)

Canada model (98 model)

CAUTION

TO AVOID SERIOUS INJURY:

FOR MAXIMUM SAFETY PROTECTION IN ALL TYPES OF

CRASHES, YOU MUST ALWAYS WEAR YOUR SAFETY

BELT.

DO NOT INSTALL REARWARD FACING CHILD SEATS IN

ANY FRONT PASSENGER SEAT POSITION.

DO NOT SIT OR LEAN UNNECESSARILY CLOSE TO THE

AIRBAG.

DO NOT PLACE ANY OBJECTS OVER THE AIRBAG OR

BETWEEN THE AIRBAG AND YOURSELF.

SEE THE OWNER'S MANUAL FOR FURTHER INFORMA-

TION AND EXPLANATIONS.

THE SRS MUST BE INSPECTED TEN YEARS AFTER IT IS

INSTALLED.

THE DATE OF INSTALLATION IS SHOWN OF THE DRIV-

ER'S DOORJAMB.

E: ASSISTANT INFORMATION

U.S. model

AIRBAG SEE OTHER SIDE.

U.S. model (98 model)

AIRBAG WARNING

FLIP VISOR OVER

F: STEERING COLUMN NOTICE

NOTICE

TO PREVENT SRS DAMAGE, REMOVE STEERING WHEEL

BEFORE REMOVING STEERING SHAFT CONNECTING

BOLT.

G: MONITOR NOTICE

NOTICE

• NO SERVICEABLE PARTS INSIDE.

• REFER TO SERVICE MANUAL FOR DETAILED INSTRUC-

TIONS.

H: SRS CONSOLE/GLOVE BOX INFORMATION

Canada model (95 - 97 model)

AIRBAG INFORMATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

• THE SRS MUST BE INSPECTED TEN YEARS AFTER IT IS

INSTALLED. THE DATE OF INSTALLATION IS SHOWN

ON THE CERTIFICATION PLATE, LOCATED ON THE

DRIVER'S DOORJAMB.

• DIAGNOSTIC CHECKS AND REPLACEMENT OF SRS

COMPONENTS MUST BE DONE BY AN AUTHORIZED

DEALER.

• SEE YOUR OWNER'S MANUAL FOR ADDITIONAL SRS

INFORMATION.
I: FRONT SEAT PASSENGER AIRBAG MODULE DANGER

DANGER

EXPLOSIVE/FLAMMABLE

CONTACT WITH ACID, WATER OR HEAVY METALS SUCH

AS COPPER, LEAD OR MERCURY MAY PRODUCE HARM-

FUL AND IRRITATING GASES OR EXPLOSIVE COM-

POUNDS. STORAGE TEMPERATURES MUST NOT EXCEED

200 F (100°C). FOR PROPER HANDLING, STORAGE AND

DISPOSAL PROCEDURES REFER TO SERVICE MANUAL,

SRS SUPPLEMENT.

POISON

CONTAINS POISONOUS SODIUM AZIDE AND POTASSIUM

NITRATE.

FIRST AID

IF CONTENTS ARE SWALLOWED, INDUCE VOMITING.

FOR EYE CONTACT, FLUSH EYES WITH WATER FOR 15

MINUTES. IF GASES (FROM ACID OR WATER CONTACT)

ARE INHALED, SEEK FRESH AIR. IN EVERY CASE, GET

PROMPT MEDICAL ATTENTION.

KEEP OUT OF REACH OF CHILDREN.

WARNING

THE AIRBAG INFLATOR IS EXPLOSIVE AND, IF ACCIDEN-

TALLY DEPLOYED, CAN SERIOUSLY HURT OR KILL YOU.

• DO NOT USE ELECTRICAL TEST EQUIPMENT OR PROB-

ING DEVICES. THEY CAN CAUSE ACCIDENTAL DEPLOY-

MENT.

• NO SERVICEABLE PARTS INSIDE. DO NOT DISASSEM-

BLE.

• PLACE AIRBAG UPRIGHT WHEN REMOVED.

• FOLLOW SERVICE MANUAL INSTRUCTIONS CAREFULLY.

J: PASSENGER AIRBAG CAUTION

U.S. model (98 model)

WARNING

CHILDREN CAN BE KILLED OR INJURED BY A PASSENGER

AIRBAG.

THE BACK SEAT IS THE SAFEST PLACE FOR CHILDREN

AGES 12 AND UNDER. MAKE SURE ALL CHILDREN USE

SEAT BELTS OR CHILD SEATS.

K: SRS WARNING (HOOD)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

THIS VEHICLE IS EQUIPPED WITH DRIVER AND FRONT

SEAT PASSENGER AIRBAGS.

ALL SRS ELECTRICAL WIRING AND CONNECTORS ARE

COLORED YELLOW.

TAMPERING WITH, DISCONNECTING OR USING ELECTRI-

CAL TEST EQUIPMENT ON THE SRS WIRING CAN MAKE

THE SYSTEM INOPERATIVE OR CAUSE ACCIDENTAL FIR-

ING OF THE INFLATOR.

WARNING

THE AIRBAG INFLATOR IS EXPLOSIVE AND, IF ACCIDEN-

TALLY DEPLOYED, CAN SERIOUSLY HURT YOU. FOLLOW

SERVICE MANUAL INSTRUCTIONS CAREFULLY.ProCarManuals.com

Steering — Sectio n 1 7
Suspensio n — Sectio n 1 8
Brake s — Sectio n 1 9
ProCarManuals.com

Engine Removal/Installation

Removal (cont'd)

7. Remove the battery cables from the under-hood fuse/

relay box.

BATTERY

CABLES

8.

9.
UNDER-HOOD

FUSE/RELAY BOX

Disconnect the engine wire harness connector on

the right (passenger's) side of the engine compart-

ment.

Remove the battery cable from the under-hood ABS

fuse/relay box.

BATTERY

CABLE

ENGINE WIRE

HARNESS

UNDER-HOOD ABS

FUSE/RELAY BOX
10. Remove the intake air duct and vacuum hose.

INTAKE AIR

DUCT

11.
VACUUM

HOSE

Remove the adjusting bolt, locknut and mounting

bolt, then remove the power steering (P/S) pump

belt and pump.

MOUNTING BOLT

10 x
1.25
mm

49 N-m (5.0 kgf-m, 36 Ibf-ft)

ADJUSTING

BOLT

P/S PUMP

BELT

LOCKNUT

8 x
1.25
mm

22 N-m (2.2 kgf-m,

16 Ibf-ft)ProCarManuals.com

Component Location s
Index
NOTE :
• I f a n intac t airba g assembl y ha s bee n remove d fro m a scrappe d vehicl e o r ha s bee n foun d defectiv e o r damage d dur -
in g transit , storag e o r service , i t shoul d b e deploye d (se e sectio n 24 ).
• Befor e removin g th e steerin g gearbox , remov e th e driver' s airba g assembl y an d steerin g wheel .
• Afte r installin g th e steerin g gearbox , chec k th e whee l alignmen t an d adjus t i f necessary .
SR S component s ar e locate d in thi s area . Revie w th e SR S componen t locations , precautions , an d procedure s in th e SR S
( sectio n 24 ) befor e performin g repair s o r service .
STEERIN G WHEE LRemoval , pag e 17-2 7
Disassembly/Reassembly , pag e 17-2 8
Installation , pag e 17-2 9
RESERVOI RFluid Replacement , 17-2 4
VALVE BOD Y UNI T
Overhaul , pag e 17-5 2
POWE R STEERIN G SPEE D SENSO R
Replacement , pag e 17-2 1
STEERING COLUM N
Removal , pag e 17-3 1
Inspection , pag e 17-3 3
Installation , pag e 17-3 4IGNITIO N SWITC HSee sectio n 2 3
POWE R STEERIN G PUM P
Pum p Bel t Inspection , pag e 17-2 3
Pum p Bel t Adjustment , pag e 17-2 3
Pum p Pressur e Check , pag e 17-2 5
Removal , pag e 17-3 7
Disassembly , pag e 17-3 7
Reassembly , pag e 17-4 2
Installation , pag e 17-4 6
STEERIN G GEARBO XRack Guid e Adjustment , pag e 17-2 4
Removal , pag e 17-4 7
Disassembly , pag e 17-4 9
Reassembly , pag e 17-5 6
Installation , pag e 17-6 6 TIE-RO
D EN D BAL L JOIN T
Bal l Join t Boo t Replacement , pag e 17-6 9
ProCarManuals.com

System Descriptio n
This powe r steerin g syste m is speed-sensitive . It s mai n component s ar e a mechanica l spee d sensor , a rotar y valve-typ e
gearbox, an d a constan t volume , vane-typ e pump . Th e syste m regulate s th e powe r assis t accordin g to vehicl e speed , roa d
conditions , an d drivin g style . Th e amoun t o f powe r assis t change s linearl y fro m hig h assist , whe n drivin g a t lo w speed s o r
parking , t o lo w assist , whe n drivin g a t hig h speeds .
Fluid Flo w Diagra m
The flui d volum e fro m th e pump , whic h i s drive n b y th e cran k pulley , i s regulate d b y th e flo w contro l valv e buil t int o th e
pump . Th e regulate d flui d i s fe d t o th e valv e bod y uni t locate d outsid e th e pinio n shaf t o f th e steerin g gearbox . Th e flui d i s
regulate d t o th e prope r pressur e b y th e valve s i n th e valv e bod y uni t an d b y th e powe r steerin g spee d senso r befor e it
flow s t o th e powe r cylinder . Th e directio n o f th e flo w is determine d b y th e rotar y valve . Th e flui d the n returns to th e reser -
voi r throug h th e retur n passag e an d i s fe d t o th e pum p again .
To RESERVOI R
VALVE BOD Y UNI T
TORSIO N BA R
INPU T SHAF T
VALVE (SLEEVE )
RIGHT CYLINDE R PASSAG E
POWE R CYLINDE R
Steering Gearbo xLOW SPEE D FEE D PASSAG E
The steerin g gearbo x i s th e rack-and-pinio n type . Th e valv e bod y uni t consist s o f th e valv e bod y unit , wher e th e flui d pas -
sag e i s regulate d b y th e flui d pressure , an d th e assis t contro l valv e uni t whic h regulate s th e flui d passag e t o th e rotar y
valv e accordin g t o vehicl e speed .
ASSIST CONTRO L VALV E UNI T
STEERIN G RAC K VALV
E BOD Y UNI T
ToRESERVOI R
From PUM P
POWE R CYLINDE RCYLINDE
R LINE S ASSIS
T CONTRO L VALV E UNI T
PUM P
To POWE R STEERIN G
SPEE D SENSO R
PUM
P OUTLE T
HIGH-PRESSUR E
HIGH SPEE D
FEE D PASSAG E
POWER STEERIN G
SPEE D SENSO R
RESERVOI R
LEFT CYLINDE R
PASSAG E
ProCarManuals.com

Steering Pum p
Constructio n
The pum p is a vane-typ e incorporatin g a flo w contro l valv e (wit h a n integrate d relie f valve ) an d i s drive n b y a POLY-V-bel t
fro m th e cran k pulley . Th e pum p feature s 1 0 vanes . Eac h van e perform s tw o intake/discharg e operation s fo r ever y rota -
tio n o f th e rotor . Thi s mean s tha t th e hydrauli c flui d pressur e puls e become s extremel y smal l durin g discharge .
DRIVE SHAF TFLOW CONTRO L VALV E
CAM RIN G
INLE T POR TVANE
ROTO R
Operatio n
The belt-drive n pulle y rotate s th e roto r throug h th e driv e shaft . A s th e roto r rotates , th e hydrauli c pressur e i s applie d t o
th e van e chambe r o f th e roto r an d th e vane s wil l rotat e whil e bein g pushe d ont o th e inne r circumferenc e o f th e ca m ring .
Th e inne r circumferenc e o f th e ca m rin g ha s a n extende d portio n wit h respec t t o th e cente r o f th e shaft , s o th e vane s
mov e downwar d i n th e axia l directio n a s th e roto r rotates . A s a resul t o f thi s rolle r movement , th e interna l volum e o f th e
van e chambe r wil l change , resultin g i n flui d intak e an d discharge .
START O F FLUI D INTAKE :FLUID INTAKE :FLUID MOVEMENT :FLUID DISCHARGE :
DISCHARGE POR T
The vane s ar e pushe d ont othe inne r circumferenc e o f th ecam ring .
The volum e o f th e van e cham -ber increase s s o tha t flui d i ssucke d in .
Th e sucked-i n flui d move stoward th e discharg e port .As th e vane s retur n t o th ethei r origina l positio n o n th einne r side , th e volum e o f th evan e chambe r decrease s s othe flui d i s discharge d fro mthe discharg e port .
ProCarManuals.com

System Descriptio n
Steering Pum p (cont'd )
Flow Contro l
Fluid fro m th e pum p run s throug h a meterin g orific e to
th e valv e bod y unit . Thi s create s a pressur e differenc e
betwee n th e pum p an d valv e bod y uni t side s o f th e ori -
fice. Whe n pressur e in th e pum p sid e is highe r tha n th e
forc e o f th e sprin g holdin g th e flo w contro l valv e closed ,
i t pushe s th e valv e dow n (open) , an d exces s flui d
return s t o th e pum p inlet . Th e combine d effec t o f th e
meterin g orific e an d th e flo w contro l valv e provide s a
relativel y constan t flo w o f flui d t o th e valv e bod y unit .
PUM P
FLO W CONTRO L
VALVE
RELIEF VALV E OPE N
DAMPIN G
ORIFICE
FLOW CONTRO L
VALV E
RELIE F VALV E BAL L
METERIN GORIFICE
To Valv e bod y Uni t
Pressur e Relie f
As pressur e o n th e valv e bod y uni t sid e build s up , i t
pushe s th e relie f valv e bal l (insid e th e flo w contro l
valve ) u p agains t it s spring , an d exces s flui d return s t o
th e pum p inlet . As the pressur e unde r th e flo w contro l
valv e drops , th e relie f valv e bal l i s close d b y it s spring ,
an d th e flo w contro l valv e i s force d dow n again , allow -
in g exces s flui d fro m th e pum p sid e t o retur n t o th e
inlet . Thi s flo w contro l valve-relie f valv e cylinde r keep s
pump outpu t pressur e betwee n 7,00 0 - 8,00 0 kP a (7 0 - 8 0
kgf/cm2, 99 5 - 1,13 8 psi) .
ProCarManuals.com

One-way Valve (In Power Steering Speed

Sensor)

When the vehicle is moving at high speed, negative

pressure develops at the sensor inlet because the power

steering speed sensor is pumping faster than the fluid

can be supplied. To compensate for this, the outlet and

inlet ports are connected internally by a passage con-

taining a one-way valve that lets output fluid recirculate

to the inlet port to equalize pressure.

Driving at High Speed:

ONE-WAY VALVE
RESERVOIR

ROTORS
Relief Valve (In Power Steering Speed Sensor)

When the vehicle is moving in reverse, the power steer-

ing speed sensor also turns backward and pumps fluid

in the opposite direction. To avoid building up pressure

in the reaction chambers that would increase steering

effort while driving in reverse, the inlet and outlet-ports

are connected by a second internal passage containing a

relief valve that allows the fluid to recirculate.

Driving in Reverse:

RESERVOIR

RELIEF VALVEProCarManuals.com

Valve Bod y Uni t
The rotar y valv e bod y uni t ha s tw o valves , a lo w spee d valv e an d a hig h spee d valve , whic h ca n b e identifie d b y th e cham -
fer width.
CHAMFE R O F HIG H SPEE D VALVE : LARG E
HIG H SPEE D VALV E
SLEEV E
CHAMFE R O F LO W SPEE D VALVE : SMAL L
LO W SPEE D VALV E
The openin g are a (th e ga p betwee n th e inpu t shaf t an d th e sleeve ) o f th e tw o valve s change s wit h th e displacemen t angl e
(angl e ga p betwee n th e inpu t shaf t an d th e sleeve ) produce d durin g steering . I n othe r words , th e valv e openin g are a
change s accordin g t o th e intensit y o f th e roa d reactio n (steerin g torque) .
Whe n th e vehicl e i s stopped , th e powe r steerin g spee d senso r function s operat e onl y th e lo w spee d valve .
Becaus e th e lo w spee d valv e ha s th e smal l chamfe r an d thereb y th e smal l openin g area , hig h flui d pressur e ca n b e fe d t o
th e powe r cylinde r wit h th e smal l displacemen t angl e (smal l steerin g torque) , resultin g i n ligh t steerin g (hig h assist) .
FLOW: 0 (ZERO ) OPENIN
G ARE A
HIG H SPEE D
VALV E
SMALL A
t STO P
DISPLACEMEN T ANGL E
When drivin g th e vehicle , th e flui d i s applie d t o th e hig h spee d valve , too , a s th e vehicl e spee d senso r functions . Becaus e
th e hig h spee d valv e ha s a larg e chamfe r an d thereb y th e larg e openin g area , th e openin g are a o f th e tw o valve s i s com -
pounded , eve n thoug h th e displacemen t angl e i s th e sam e a s whe n th e vehicl e i s stopped .
Therefore , th e flui d pressur e i s no t generate d unles s th e displacemen t angl e i s larg e (larg e steerin g torque) , resultin g i n
moderatel y heav y steerin g (mediu m assist) .
From ASSIS T CONTRO L VALV E
HIG H SPEE D
VALV E OPENIN
G ARE A
LARG EAREA
MIDDL EAREA
SMAL LAREA
At STO P
PRESSUR E MIDDL
E SPEE D RANG EPRESSUR E
DISPLACEMEN T ANGL E
T
o RIGH T CYLINDE R
LO
W SPEE D VALV E
HIGH-PRESSUR
E
Fro
m LEF T CYLINDE R HIG
H SPEE D RANG E
PRESSUR E
Fro
m LEF T CYLINDE R
HIGH-PRESSUR E
LO W SPEE D VALV E
T o RIGH T CYLINDE R
INPUT SHAF T
ProCarManuals.com